What was the coolest airline you've seen or flown on?

I’ve not flown on too many exotic airlines, but I’ve flown Avianca and Sansa Airlines. I flew Sansa from SJO to TMU in Costa Rica on a Grand Caravan. It was back when TMU was an unpaved gravel strip. TMU has a beach at the end, Much like Maho Beach at Princess Juliana. The terminal is still a bench with a 4 parking space lot and a scale for your bags.

I’ve seen Aer Lingus and Frenchbee while planespotting, as well as a Las Vegas Sands private jet.